Category Archives: Other

What is Geopolymer cement?

I have been confused by the term “Geopolymer cement (concrete)” for long time. Some researchers told me Geopolymer cement is essentially alkali activated cement/material (AAMs), such as alkali activated slag and fly ash. Since alkali activated slag is indeed a kind of geopolymer cement, it looks logical to consider Geopolymer cement as alkali activated cement. […]

Buoyancy Effect of TGA Experiment

What is Buoyancy Effect of TGA experiment? TGA (thermogravimetric analysis) is an important method to analyze the hydration products of cementitious materials. When a TGA test for cementitious materials sample is performed, the initial TGA curve may appears as such: As can be seen from the curve, the mass exceeded the original mass, which is […]

What is density? how to distinguish different density definitions?

As material researchers, we know density is the physical property of materials. Even since grade school, we are taught that density is simply the mass of an object divided by its volume. However, this is pretty complicated in the case of cementitious materials. The mass of a certain amount of harden cement (or concrete) paste […]